California Code
ARTICLE 6 - American Independent Presidential Primary Ballot
Section 6621.

6621. Any person who believes his or her name may be used as a write-in candidate for President of the United States shall, not later than 21 days before the primary election, file his or her endorsement of his or her write-in candidacy with the Secretary of State, or no votes shall be counted for him or her.

(Enacted by Stats. 1994, Ch. 920, Sec. 2.)